Inclined vibrating screen



0d. 17, 1939. R A, DENOVAN 2,176,376

INCLINED VIBRATING SCREEN Filed July 15, 1936 2 Shets-Sheec l ,INVENTOR: ROBERT A. DENOVAN Q a [v a sv Aw'oml EY.

Oct. 17, 1939. R. A.'DENOVAN INCLINE'D VIBRATING SCREEN 2 Sheets-Sheet 2 Filed July 15, 1956 V Patented Oct. 17, 1939 PATENT GFFHQE IN CLINED VIBRATING SCREEN Robert Andrew Denovan, Asbestos, Quebec,

Canada Application July 15, 1936, Serial 'No. 90,630

3 Claims.

This invention relates to inclined vibrating screens for use in screening ore, gravel, crushed stone and the like, and more particularly to a means for stabilizing the movement of such screens.

In screens of this type hitherto proposed, difficulty has been experienced in providing a satisfactory type of mounting therefor. In most cases, the mounting permits the screen, during its reciprocatory vibrating movement, to move out of its normal parallel path with respect to its inclined positionv and thus there is a tendency to throw the material being screened.

The object of the present invention is to provide a screen in which the movement thereof is stabilized by means of a novel mounting whereby the screen always vibrates in the same path.

The invention will be described with reference to the accompanying drawings, in which,

Figure 1 is a side elevation of a screen embodying the invention,

Figure 2 is a plan,

Figure 3 is a section on line 3--3 of Figure 1,

Figure 4 is a section on line 4-4 of Figure 3,

and

Figure 5 is a section on line 5-5 of Figure 2.

In the drawings, I is a screening member carried by supporting side plates 2, 3 a supporting frame, 4 the stabilizing means for mounting the screening member in the frame 3 and 5 a means for imparting the vibratory movement to the screening member.

The stabilized mounting means 4 includes a pair of reach bars 6 on either side of the screening member i and connected at either end by means of radius links I, pivotally mounted between the bars, to the screen supporting plates 2 by means of brackets 8 in which the radius links also have a pivotal mounting. The reach bars 6 are also connected at either end to the frame 3 by means of a second series of similar radius links 1', also pivotally mounted between the bars and in a second series of similar brackets 8' carried by the frame 3. It will be noted 5 that the normal mounting position of the first series of links I is at an angle of approximately 60 and that the normal mounting position of the second series of links 1 is at right angles to the first series.

5 A suitable type of radius link is illustrated and comprises a wooden core 9 and metal sheeting members- It, a cylindrical space H being formed at either end. Mounting of each pair of links I and I in the reach bars 6 is effected by means 55 of a single fitting l2 having bearing pins [3 proing through a bore in the pins l3 and corresponding holes in the reach bars. Mounting of ,.5 the other end of the links 1 and 'l' in the brackets '8 and 8" respectively is effected by means of a fitting l6 bolted at H to the outer wall of a housing I8 formed on each bracket. The fitting I6 is formed with a bearing pin l3 provided 10 with a rubber bushing I4 adapted to extend into the cylindrical spaces II at the other ends of the links, assembly being by a bolt 19 extending through a bore in the pins I3 and correspen-ding holes in the outer and inner walls of the 15 housing l3.

A resilient steadying support is provided for the screening member and consists of a spring 25! mounted at either end on each side thereof by means of a spring engaging fitting 2| which may 20 be bolted to the ends of the reach bars by the bolts !5 and a complementary spring engaging fitting 2| secured to the frame 3. The springs 20 serve to relieve the bearings of the weight of the screening member. 25

The means 5 for imparting the vibratory movement to the screening member comprises a driven shaft 22 located at the centre of gravity of the screen having an eccentric mounting 23 secured to each side plate 2. The shaft 22 is journalled 30 in roller bearing pillow blocks 22 mounted on the frame 3. The eccentric mounting 23, as particularly shown in Figure 5, consists of an eccentric portion 24 of shaft 22, a bearing housing 25 containing roller bearings 26 and cooperating 35 bearing members 21 and 28 mounted on the housing 25 and eccentric portion 24 respectively.

A balance wheel 29 for counterbalancing the movement of eccentric mounting 23 is mounted on shaft 22 and runs between the reach bars 6. 40 A housing 30, the ends of which are carried by the bearing housings 25, is provided for the eccentric portion 24.

In operation, the stabilizing means 4, by reason of the particular mounting of the radius links, serves to control the vibrating movement of the screening member whereby its path of movement always remains the same.

The rubber bushings i4 and 14' are of sufficient resiliency to accommodate the flexing movement of the radius links, there thus being no frictional movement and consequent wear of joints. The rubber bushings also act as cushioning means to prevent stresses in the bearing pins, reach bars and related parts.

Instead of the two pairs of reach bars described, only one bar on either side could be employed. Moreover, means may be provided for adjusting the position of the reach bars with respect to the frame whereby the angle of inclination of the screen may be varied.

I claim:

1. In an inclined vibrating screen including a screening member and a support therefor, mounting means for the screening member in the support comprising a bar member adjacent to the screening member, a series of parallel links equal in length pivoted to the screening member and to the ends of said bar member, a second series of parallel links equal in length pivoted to the support and to the ends of said bar member, and means carried by said support for resiliently supporting said bar member adjacent either end thereof.

2. In an inclined screen having a frame and means for imparting circular vibratory motion to the screen, means for connecting the screen to the frame whereby said vibratory motion is substantially uniform in amplitude throughout the screen comprising a bar extending longitudinally of the screen and adjacent the side there'- of, a series of parallel links equal in length pivotally connecting the screen and said bar and a second series of parallel links equal in length pivotally connecting said bar and the frame, and resilient means acting on said connecting means comprising a plurality of coil springs, one end of each spring having engagement with the frame and the other end of each spring having engagement with said bar.

3. In an inclined screen having a frame and means for imparting a circular vibratory motion to the screen, means for connecting the screen to the frame whereby said vibratory motion is substantially uniform in amplitude throughout the screen comprising a pair of bars on either side of the screen and extending longitudinally thereof, parallel links equal in length having pivotal connections with either end of each pair of bars and the screen and parallel links equal in length having pivotal connections with either end of each pair of bars and the frame, and resilient supporting connections between the frame and the bars comprising a plurality of coi1 springs, a seat for one end of each spring carried by the frame and a seat for the other end of each spring carried adjacent either end of each pair of bars.

ROBERT ANDREW DENOVAN. 

